Author
- Ibn al-Kharrāṭ1
- Ibn al-Ḥājib1
- Ibrahim Efendi1
- Ibrāhīm al-Ḥalabī1
- Ibrāhīm al-Ḥusaynī1
- Imbert Feutrier1
- Immanuel Bonfils1
- Imām al-Dīn ibn Luṭf Allāh Lāhūrī1
- Isaac Israeli ben Joseph1
- Isaac Israeli ben Solomon1
- Isidore of Seville1
- Ismail ibn Hammad al-Jawhari1
- Ivo of Chartres1
- Jacobus Dinetus1
- Jacobus de Voragine1
- Jacopo Ragone1
- Jacques Millet1
- Jakob Christoph Blarer von Wartensee1
- Jalal al-Din al-Suyuti1
- Jawād ibn Saʻd Jawād al-Baghdādī1